A great way to set embroidery designs and help them stand up really well over time and multiple washings is to put the piece on a heat press once the embroidery backing is trimmed.
Like all fibers, embroidery thread has a memory. Applying heat and pressure sets the memory of the threads. This may reduce rippling or puckering once the garment is washed. Note: when working with a polyester or micro fleece, it's important to know the heat tolerance before heat pressing.